Financial risk management (Details 5) - USD ($) $ in Thousands |
9 Months Ended | 12 Months Ended |
|---|---|---|
Sep. 30, 2025 |
Dec. 31, 2024 |
|
| Statement [Line Items] | ||
| Derivative instruments - liabilities | $ 0 | $ 709 |
| Credit facility | 9,400 | |
| Level 1 [Member] | ||
| Statement [Line Items] | ||
| Cash and cash equivalents | 39,100 | 20,002 |
| Restricted cash | 4,672 | 4,527 |
| Level 2 [Member] | ||
| Statement [Line Items] | ||
| Trade and other receivables | 10,598 | 7,132 |
| Derivative instruments - assets | 2,861 | 0 |
| Derivative instruments - liabilities | 0 | 709 |
| Metals contract liability | 44,618 | 40,868 |
| Silver contract liability | 28,566 | 18,193 |
| Level 3 [Member] | ||
| Statement [Line Items] | ||
| Royalty payable | 3,062 | 2,762 |
| Amortized cost [Member] | ||
| Statement [Line Items] | ||
| Pre-payment facility | 2,550 | 2,000 |
| Credit facility | 9,160 | 9,490 |
| Term loan facility | 48,019 | 0 |
| Convertible debenture | $ 0 | $ 10,849 |